Apparatus fob making color motion



March 29, 1938.

o; c. GILMORE APE ARATUS FOR MAKING COLOR MOTION PICTURES AND CAMERAS THEREFOR Original Filed Nov. 3, 1928 2 Sheets-Sheet l "Qylu cr/zf/(l- 0/ (I Gilmore @w& s

March 29, 1938. QgGILMORg 'Re.20,678

APPARATUS FOR MAKING COLOR MOTION PICTURES AND CAMERAS THEREFOR Original Filed Nov. 3, 1928 2 Sheets-Sheet 2 Reiaued Mai-Q29, 1938 UNITED i STATES PATENT OFFICE APRARATUS FOR MAKING COLOR MO' IION PICTURES THEREFOR Otto C. Gilmore, Los Angeles, Calif., assignor,- by

mesne assignments, to Cinemacolor Corporation, Chicago, 111., a corporation of Delaware- 2 Claims.

This invention relates to the apparatus for making motion pictures in natural colors and to the cameras therefor and has for its object the production of negatives wherein all of the images and color records required for the making of a single projected image in color will be located in the spaced or frame on the film heretofore devoted to a single black and white image. While so locating the images and color records for a single projected image in color in the space or frame normally-provided for a single black and white image, the present invention also provides a path for the recording of sound values.

Among its other objects, the present invention contemplates the ready conversion of a standard black and white image camera to one for taking simultaneous images and color records.

with the above and other objects in view, as will be apparent, this invention, among other things, consists in the construction, combina- 'tion and arrangement of parts, all as hereinafter more fully described, claimed and illustrated in the accompanying drawings, wherein:

Fig. l is a side elevation of a standard motion picture camera, with part of the housing broken away, to disclose the present attachment. for converting the camera from the taking of black and white images to the taking of color images and records in place therein;

Fig. 2 is a front elevation thereof showing the image tumingdevice in position;

Fig. 3 is an elevation of a section of film made by a, camera including the present invention;

Fig. 4 is alongitudinal section taken through the attachment forming part of the subject matter of the present invention; I

Fig. 5 is an elevation of said attachment, taken at right angles to Fig. 4, parts thereof being broken away to illustrate the image splitting device and the light filters;

Fig.- B'is a perspective view of the image splitting device and the color filters; and

Fig. "l is a perspective view of the image turning device.

Heretofore in the making of motion pictures in natural colors, it has been necessary to use special cameras, which are not adapted to the taking of black and white pictures, and to subject the negatives thus produced to complicated and expensive laboratory treatment. This is cocasioned by the fact that it is necessary to take two or more images and color records for each resulting projected image in natural colors. The quantity of negative film heretofore required for pictures in natural colors is two or three times as much as that required for black and white pictures. Furthermore, when these double negatives have been made the positives produced therefrom must be projected in a specially constructed projecting machine or must be processed.

and treated in the laboratory to correlate the respective color records whereby a single film is produced for projection purposes. The former of these two methods requires each producer to install at least one expensive projecting machine which can be used only in conjunction with color pictures, while the-latter method involves extremely expensive laboratory treatment, produces a film that is awkward to handle and is fragile, and wherein the images of the color records are often out of register and open to other serious/practical objections.

The present invention is designed to place the making and projecting of motion pictures in natural colors on a parity with the making and projecting of black and white pictures, as to quantity of film used, both negative and positive, the treatment in thelaboratory, and the apparatus used in making'and projecting.

Where a double color record is used involving one image through a red-orange filter and one through a blue-green filter, the placing of these twoim'ages in the'space or frame of the film ordinarily occupied by a/black and white image would, when the images are positioned normally, either distort the shape and size of the images or so reduce the size-that its length projection would be limited. Therefore, the present invention contemplates turning the'images through ninety (90") degrees so that the two images will rest on their ends or sides in a single frame of the negative film. This will also provide ample space between one of the images and thenext adjoining marginal perforations for the recording of sound.

Reference being had more particularly to the drawings Fig. 3 illustrates a section of negative film, which is provided with the marginal perforations ll and'a series of spaces or frames [2. Each of these spaces or frames i2 is of a size designed to receive a single black and white image. In the practice of the present invention, a

a path for single space or frame I! receives the red orange iected as shown in Fig. 3, without image turning devices, the resulting projected image would be viewed on its side. Hence the present invention includesan attachment in the camera which, during'the process of photographing a single object, will create two images thereof in a single space or frame l2 on the film In with the images resting on their sides and their tops and bottoms parallel to the film edges. This method also provides a path [6a, for the recording of sound values parallel to the edges of the fllm HI and between one row of images i3 and the next adjoining marginal perforations ll.

The attachment designed to create the images I! and il in a space or frame l2 from a single exposure and to turn the images through ninety degrees (90) so that they rest upon their sides, comprises a tube ii of a shape and size to enter the lens aperture of a standard camera H. To convert the camera I! from the taking of black and white pictures to the taking of moving pictures in natural colors, the lens for black and white photography is removed and the tube l6 inserted in its place.

Cooperating with this front end of the tube I6 is a metallic shell l8, which has a projecting ear I! through which a screw operates to hold shell I! in place. The shell I! houses the image turning prism P (illustrated in Fig. 7), which receives the image of the object. and turns it through ninety degrees (90) before it enters the a tube I. This prism P includes two light transmitting surfaces 2| and 22 and three light reflecting surfaces 23, 24 and 25. One of the transmittlng surfaces 2I-22 is aligned with the outer end of the tube while the other surface faces the object being photographed. Thelight hearing the image of the object enters through the transmitting surface 2| and is reflected at right angles by the surface 25 to the reflecting surface 24 where it is again reflected at right angles to the surface 23, which reflects it through the transmitting surface 22 into the tube l6. In being reflected by the surface 2! the image is turned through ninety degrees to rest upon its side and enters the tube in this position. The

paths of the light through the prism P are clearly illustrated in Fig. '1.

Within the tube l6 are the photographic lenses 2. through which the image turned through ninety degree passes to the rear end of the tube ll. Here the light is passed through the image splitting device S (Figs. 4, 5 and 6) which divides the light to present two images to the film at the rear of the tube l6.

This light splitting device 8 comprises a conibination of prisms or reflecting surfaces which receive, 'divide and reflect the light passing come through the tube l6. The light first contacts with the surface 21 which permits about half of the light to pass directly through to the rear of the tube It and reflects about half of it to the reflecting surface 28. The surface 28 again reflects the light into a path parallel to that passing directly through the surface 21 and through the tube [8. Thus the device S divides the light entering it and converts it into two parallel paths each bearing a complete image.

In order to determine the color records, a bluegreen filter 29 is placed in the path of light reflected by the surface 28 and a red-orange filter 3B is placed in the path of light passing directly through the surface 21. I

In this manner witha single objective, two duplicate images of different color records are created on the fllm at the rear of the tube l6, which, because of being turned through ninety degrees (90), are located on the film in the space or frame I! occupied by a single black and white image, leaving sufllcient space for the sound path lia. Hence all of the images necessary'to make a projected image in color are contained entirely within the confines of a single space or frame i2 and require no more film than do the equivalent projected images in black and white.

What is claimed is:

1. An attachment for converting an ordinary motion picture camera into a camera for taking 1 color pictures that comprises a tube adapted to replace the lens tube of the camera, a prism at the outer end of said tube having a face through .which light to form an image is received and a face through which the light is passed into the two like images and a colored light filter placed in the path of projection of each image.

2. An 'atta'chment for converting an ordinary motion picture camera into a camera for taking color pictures and adapted to replace the lens tube of the camera, that comprises a turning prism having a plurality of faces for deflecting 'the light so as to revolve the image through ninety degrees, an objective arranged to receivethe light from said prism, a prism system receiving light from the objective and arranged to split the light into two like images, and a colored light filter placed in the path of projection of each image.

O'I'IO C. GILMORE. 

